JWT Decoder
Decode and inspect JSON Web Tokens (JWT) header and payload. All decoding happens locally — your tokens are never sent anywhere.
Free Online JWT Token Decoder
JSON Web Tokens (JWT) are used everywhere for authentication — but the payload is Base64-encoded, not encrypted. This tool decodes the header and payload instantly, checks token expiry, and shows you exactly what information is inside your tokens. Everything happens client-side, so your tokens stay private.
When to use: Debugging authentication issues, inspecting issued tokens during development, checking JWT expiry before tokens cause 401 errors, learning what data your auth provider includes.
Header
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Payload
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Signature
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